m
m
Line 4: Line 4:
 
<table class="sortable"><tr>
 
<table class="sortable"><tr>
 
<th>Soil</th>
 
<th>Soil</th>
 +
<th>Hydrologic soil group</th>
 
<th>Porosity <sup>2</sup> (volume/volume)</th>
 
<th>Porosity <sup>2</sup> (volume/volume)</th>
 
<th>Field capacity (volume/volume)</th>
 
<th>Field capacity (volume/volume)</th>
Line 12: Line 13:
 
<tr>
 
<tr>
 
<td>Sand</td>
 
<td>Sand</td>
 +
<td>A (GM, SW, or SP)</td>
 
<td>0.43</td>
 
<td>0.43</td>
 
<td>0.17</td>
 
<td>0.17</td>
Line 20: Line 22:
 
<tr>
 
<tr>
 
<td>Loamy sand</td>
 
<td>Loamy sand</td>
 +
<td>A (GM, SW, or SP)</td>
 
<td>0.44</td>
 
<td>0.44</td>
 
<td>0.09</td>
 
<td>0.09</td>
Line 29: Line 32:
 
<tr>
 
<tr>
 
<td>Sandy loam</td>
 
<td>Sandy loam</td>
 +
<td>A (GM, SW, or SP)</td>
 
<td>0.45</td>
 
<td>0.45</td>
 
<td>0.14</td>
 
<td>0.14</td>
Line 35: Line 39:
 
<td>0.09</td>
 
<td>0.09</td>
 
</tr>
 
</tr>
 
 
<tr>
 
<tr>
 
<td>Loam</td>
 
<td>Loam</td>
 
<td>0.47</td>
 
<td>0.47</td>
 +
<td>B (ML or OL)</td>
 
<td>0.25 to 0.32</td>
 
<td>0.25 to 0.32</td>
 
<td>0.09 to 0.15</td>
 
<td>0.09 to 0.15</td>
Line 44: Line 48:
 
<td>0.16</td>
 
<td>0.16</td>
 
</tr>
 
</tr>
 
 
<tr>
 
<tr>
 
<td>Silt loam</td>
 
<td>Silt loam</td>
 +
<td>B (ML or OL)</td>
 
<td>0.50</td>
 
<td>0.50</td>
 
<td>0.28</td>
 
<td>0.28</td>
Line 53: Line 57:
 
<td>0.17</td>
 
<td>0.17</td>
 
</tr>
 
</tr>
 
 
<tr>
 
<tr>
 
<td>Sandy clay loam</td>
 
<td>Sandy clay loam</td>
 +
<td>C</td>
 
<td>0.4</td>
 
<td>0.4</td>
 
<td></td>
 
<td></td>
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<td></td>
 
<td></td>
 
</tr>
 
</tr>
 
 
<tr>
 
<tr>
 
<td>Clay loam</td>
 
<td>Clay loam</td>
 +
<td>D</td>
 
<td>0.46</td>
 
<td>0.46</td>
 
<td>0.32</td>
 
<td>0.32</td>
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<td>0.17</td>
 
<td>0.17</td>
 
</tr>
 
</tr>
 
 
<tr>
 
<tr>
 
<td>Silty clay loam</td>
 
<td>Silty clay loam</td>
 +
<td>D</td>
 
<td>0.47 to 0.51</td>
 
<td>0.47 to 0.51</td>
 
<td>0.30 to 0.37</td>
 
<td>0.30 to 0.37</td>
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<td>0.14</td>
 
<td>0.14</td>
 
</tr>
 
</tr>
 
 
<tr>
 
<tr>
 
<td>Sandy clay</td>
 
<td>Sandy clay</td>
 +
<td>D</td>
 
<td>0.43</td>
 
<td>0.43</td>
 
<td></td>
 
<td></td>
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<td></td>
 
<td></td>
 
</tr>
 
</tr>
 
 
<tr>
 
<tr>
 
<td>Silty clay</td>
 
<td>Silty clay</td>
 +
<td>D</td>
 
<td>0.47</td>
 
<td>0.47</td>
 
<td></td>
 
<td></td>
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<td></td>
 
<td></td>
 
</tr>
 
</tr>
 
 
<tr>
 
<tr>
 
<td>Clay</td>
 
<td>Clay</td>
 +
<td>D</td>
 
<td>0.47</td>
 
<td>0.47</td>
 
<td>0.32</td>
 
<td>0.32</td>

Revision as of 21:06, 25 November 2015

Recommended values for porosity, field capacity and wilting point for different soils.1
Link to this table.

Soil Hydrologic soil group Porosity 2 (volume/volume) Field capacity (volume/volume) Wilting point (volume/volume) Porosity minus field capacity (volume/volume)3 Field capacity minus wilting point (volume/volume)4
Sand A (GM, SW, or SP) 0.43 0.17 0.025 to 0.09 0.26 0.11
Loamy sand A (GM, SW, or SP) 0.44 0.09 0.04 0.35 0.05
Sandy loam A (GM, SW, or SP) 0.45 0.14 0.05 0.31 0.09
Loam 0.47 B (ML or OL) 0.25 to 0.32 0.09 to 0.15 0.19 0.16
Silt loam B (ML or OL) 0.50 0.28 0.11 0.22 0.17
Sandy clay loam C 0.4 0.07
Clay loam D 0.46 0.32 0.15 0.14 0.17
Silty clay loam D 0.47 to 0.51 0.30 to 0.37 0.17 to 0.22 0.16 0.14
Sandy clay D 0.43 0.11
Silty clay D 0.47 0.05
Clay D 0.47 0.32 0.20 0.15 0.12

1Sources of information include Saxton and Rawls (2006), Cornell University, USDA-NIFA, Minnesota Stormwater Manual
2Soil saturation is assumed to be equal to the porosity.
3This value may be used to represent the volume of water that will drain from a bioretention media.
4This value may be used to estimate the amount of water available for evapotranspiration